Yes it isn't normal, and there are a few things that can cause it. Which is why it is recommended that if you don't know what your doing to take it to a shop for their opinion. Also because not everyone knows these bmw problems that well.
I'd suggest taking it to one of the sponsors who specializes in BMWs and will be able to give you a better diagnosis than someone on an internet forum will be able to.
Originally Posted by dcramer
So I take this is not normal. I did look at the vanos diagnostic information, and suspect that it could be the problem. However it's considerable amount of work to fix. I'd like to make sure this isn't normal before I go down the path of fixing it.